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(No Model.) G. H. ZSGHECH.

SAW MILLv FEED MBGHANISM.

Patented 001;.17, 1882..

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N. PETERS Pnma-Lilhugmphnr. wasmngmn. D. C.

UNITED STATES PATENT GEEICE.

eUsrAvUs n. ZscHEcH, or INDrANAPoLIs, INDIANA.

SAW-MILL FEED MECHANlSlVI.

SPECIFICATION forming part of Letters Patent No. 266,003, dated Oetoloei` 17, 1882.

Application tiled January 6, 1882.

(No model.)

' To all whom it may concern:

Be it known that I, GUsrAvUs H. ZseHEoH, of Indianapolis, Marion county, in the State of Indiana, have invented certain new and useful Improvements in Saw- Mill Mechanisms, ot' which the following is a specitication.

The same relates to the back motion for the carriage on which the log is fed to the saw. I move the carriage backward rapidly, and thus economize time. I provide on the sawarhor a pulley rotated with the great power and high velocity given to the saw, and communicate lnotion by friction from that pulley to the carriage. 1-mount near the saw-arbor a large pulley properly geared to the carriage, with means for giving it a slightmotion toward and from the said friction-pulley on the sawarbor. These pulleys are kept outof Contact during the long period while the log is fed slowly forward to the saw, and are forced into connection during theshorter period while the log is being run rapidly back; but inasmuch as the position of the. saw-arbor requires to be changed fromv various causes, eminently the gradual lessening ofthe diameter of the saw as it is consumed by use, l mount an additional vpulley loosely between the two, with capacity for adjustment relatively to the linejoiuing the two pulleys, so that any change ot' position of the saw-arbor maybe compensated for by a corresponding adjustment ofthefintermediate pulley, and the several pulleys be always ready to engage by friction on slightly moving the bearings of the back-motion pulley. My intermediate pulley swings freely and truly on its point of suspension. lt is held by gravity out of contact with the pulley on the saw-arbor, eX- cept when it is intentionally forced up to induce the required back motion. My intermediate pulley is also capable of adjustment by nice increments to and from the center line joining the other pulleys. It can also swivel to present its surfaces fairly to the other pulleys. 'lhislatteris important,inasmuch as the shafts cannot be always parallel and the pulleys always true. The swiveling allows the intermediate pulley to accommodate itself and assume automatically apropcr bearing-surface, bearing against each pulley.'

The accompanying drawings form a part of Fig.2 is a plan Fig. 3 is a central section and elevation of the frictionpulley on a larger scale.

The drawings show the novel parts, with so much of the ordinary parts as is necessary to show their relation thereto. I

Similar letters of reference indicate corresponding parts in all the figures.

A Aisa tixed frame-work; B, a pulley mounted on the saw-arbor b, and. strongly turned bya broad belt running on a suitable pulley, B., on the end ofthe arbor.

M is a large friction-pulley mounted 011 a shaft, m, resting in boxes N, which are movable forward and backward in the direction of the doublepointed arrow. It is connected either directly or through intermediate gearing with the ordinary pinion, traversing in a rack, or with other suitable means not represented for traversing the carriage.

D is my intermediate loose pulley. 1t is formed of layers ot' tar-paper firmly compressed between disks ot' iron by the aid of bolts and nuts, as indica ted. .l ts pivot or prolonged axis d is held in a fork, E, which terminates above in a screw-bolt, E,whch is held loosely by the aid of nuts c and jam-nuts c', with freedom to turn in a swivetpiece, G, another holein which is bored at right angles to that which receives y the screw E. The other hole receives a stud, H', extending from a bracket, H, bolted on the framing A. A transverse pin, h, holds the piece Gr and its connections on the stud H.

The saw and the pulley B run nniforrnlyand at a high velocity. Vhile the carriage is being slowly fed forward for the saw to act my invention is of no effect; but when the log` is completely riven, or when for any reason itis desired to run the carriage back either entirely or partly, the proper movement is inade,which liberates the forward feed mechanism, (not represented,) and the boxes N, with the shalt m IOO the intermediate roller, D, and through it the pulley M, and the carriage, with its log, is rapidly run back.' The swivel-piece G, by being pivoted on the horizontal stud H', allows the intermediate pulley to swing freely. lt is held by gravity against the pulley M and o ut of oontaet with the pulley B during the period while it is out of use. It turns freely and smoothly on this strong center when required. The nuts and jam-nuts e e allow the forked piece E E', and consequently the pulley D, to be adjusted up and down, so that the pulley D shall be at a greater or less distance from the stud H', as required. The turning of the upright bolt E in a smooth Cylindrical holein the swivel-.piece G allows it, and Consequently the roller D, to swivel to any extent required in order to allow it to rest fairly against the surfaces of the respective pulleys B and M. The nuts and jamnuts e e' are set so as to maintain their places rigidlyv on the screw-bolt E', pressing but slightly against the respective faces ot' the swivelpiece G.

Modifications may be made in the details. The material of theintermediate roller, D, may be varied.

I claim as my inventionl. In a circular-saw mill having the back feed-shaft, m, driven by friction from a pulley on the sawshaft b, with provisions for moving the former toward and from the latter to make and break the connection, an intermediate pulley, D, land means e e for changing its posi- `tion to allow for different positions ofthe sawshat't b, and adapted to transmit the motion by friction, as herein speoilied.

2. Theintermediate pulley, D, and provisions e e for adjusting up and down to compensate for change in position of the saw-shaft, in Combination with the pulley M on the back feedshaft, m, means for moving the latter to make and break the friotional Contact, and the provisions l H' for allowing said intermediate pulley to swing and swivel, all substantially as herein speeitied. f

In testimony whereot'I have hereunto set my hand, at Indianapolis, Marion, Indiana, this 23d day of November, 1881,\in the presence ot' two su bseribiug witnesses.

GUSTAVUS H. ZSCHEUH.

Witnesses:

ADOLPH SniDENsTIoKER, EDWARD MUELLER. 

